Polaroid is just a brand name stuck on (usually) cheap Chinese generics.
If you are missing the USB lead, take the camera into a computer accessory place and check whether the camera can use the standard mini USB type lead.
If it has a non-standard mini USB socket I would suggest getting a card reader instead (presumably camera uses SD card).
If it takes AA batteries you don't need a power supply -- just a regular charger and some NimH batteries.
You shouldn't need any software for the camera -- once you have the lead or card reader your pictures can be transferred to computer just as if from an external removable disk drive.
See this: www.polaroid.com/media/document/pdc_640_ug_rev1.pdf